Television apparatus



Aug. 21,'1934. D, w. SHoR-r 1,970,632

TELEVISION APPARATS filed April 16,1932

lk/ j BY lfd, ATTRNEYsMf; *W

A, UNITE STATE TELEVISION APPARATUS Donald William Short, Woodridge, N. J., assigner, by mesne assignments, to Radio Corporation of America, a corporation of Delaware Application April 16, 1932, serial No. 605,580

3 Claims. (Cl. 178-6) This invention relates t television transmisable hand wheel 12 is provided for turning the sion systems, and with particularity toan imworm and worm wheel to adjust the shaft 1i). proved form of television pick-up unit for tele- Shaft 1i) has attached thereto a downwardly devision transmitters. pending housing 13 in which is mounted any 1,5.' An object of the 'invention is to provide an suitable form of motor (not shown) for driv C@ improved form of television pick-up camera having the scanning disc le. The shaft 1) alsoV sup ing a'monitoring unit attached thereto. ports another housing' 15 in which are located A feature of the invention resides in a telea photo-electric cell 16 and an amplifier 1'1. A

vision pick-up unit for `a television transmitter box 18 containing afurther amplifier and the '102 wherein the device that is used for scanning is necessary switches is attached to the platform 65" also used for monitoring the image as it is be- 19 which carries the housing 15. The platform ing transmitted. 19 has attached thereto a pair of brackets 29m Another feature of the inventionrelates to a which is supporteda suitable optical system'21 scanning device having two sets of scanning for imaging the subject or object to be telen 15., units or elements arranged in reverse order. vised, upon the scanning disc le. t will be ,7W

Other features and advantages 'not specifically noted that the scanning disc v1li is attached to enumerated willfb'e apparent after a considerathe motor shaft 22 so as to rotate in back of the tion of the following detail descriptions andthe optical system 21. appended claims.' On the opposite side of the disc le from the 20 While the invention will be described hereinoptical system 21 is another roptical system in- 75 after'as embodied inone specific form of telecluding condensing lens 23 for projecting the vision transmitterpick-undt will be understood scanned images upon the photc-electric cell 16. that the inventionl is not limited thereto, but is Attached to the left hand bracket 20 is an arm 2li. to beutilized in any other known form of telein which is supported a television reproducing l 25, vision transmitter. lamp of known type, preferably one having 80?' Referring to the drawing, 1 1 flat plate luminous target, this target being indi- Fig. 1 represents a side View in elevation of cated schematically in Fig. 3 by the numeral 25. a television transmitter pick-up embodying fea The lamp 25 may be provided with a housing havtures of the invention; ing an aperture therein as indicated schematically Fig. 2 is a front View of the'devic'e of Fig. 1; in Fig. 4, and as disclosed in detail in application 55 Fig. 3 is a detailed view of the scanning disc Serial N0. 453,890, filed May 29, lSB- The arm showing the arrangement of the two series of 24 is arranged so that the lamp 25 is in fr0-ot of perforations therein; and the disc 1li. Positioned on the opposite side of Fig. 4 is a schematic diagram of a portion of the disc and in alignment with the lamp is 35 the monitoring arrangement. an eye piece or funnel shaped member 26 for 90` Referring more particularly yto Figs. 1 and 2, viewing the lamp target through the disc openthe numeral 1 represents a stand capable of beingsing moved readily to various'positions, and for It Will be S6611 from the `foregoing descriiJOl this purpose is preferably provided with rollers thatr by rotating the handle 12 the entire telc- 40 2. Mounted 1n the stand for vertical adjustment vision pckfup apparatus can be moved or rotated 95- is a standard 3 which is capable of being locked as a unit about the shaft l0, thus preserving the in its vertically adjusted position by means of xed relation between the lens system. 21, disc 14 a suitable clamp 4. The standard 3 is rotatand the cell 16, as well as the xed relation beable about a vertical axis in the standard 5 tween the 121ml) 25 and the diSC 14. This CorilLilwhich is carried by the stand l, and a suitable struction therefore prOVidSS an assembly WhC-l T00 locking member 6 is provided for locking the is well adapted to pick up television scenes at difstandard 3 in its adjusted position. The standferent places or points since the entire unit is ard 3 carries a pair of U-shaped arms 7 and 8, easily movable on the rollers 2, and it is easily these arms converging at their upper ends to adjusted about horizontal. and vertical axes while 50.1' support trunnion bearings 9 in which is mounted maintaining the proper relation between the 0p- 105 the horizontal shaft 10. For the purpose of tical elements of the system. rotating the shaft 10 in its bearings, the said The manner in which the scanning disc 1e co'u shaft carries a worm wheel 11 which cooperates operates with the cell 16 to analyze the scene to be with a corresponding worm 12 mounted for rotelevised is in accordance with standard practice, tation on the bracket members 7 and 8. A suitand further description thereof is not believed necessary. However, it is to be noted that the scanning disc 14 instead of being provided with a single spiral set of scanning elements is provided with a double set of these scanning elements as shown in Fig. 3. The outer spiral is utilized for scanning the scene or object to be televised while the inner spiral is used `for monitoring purposes in conjunction with the lamp 25. Because of the fact that the object or scene is imaged by an ordinary lens system 21 upon the disc 24, the said image will be in a reverse up and down direction. Consequently in order that the image as monitored by the lamp 25 may be in its proper'.

relation the inner or monitoring spiral 2'? has a reverse lead from that of the outer spiral. Thus for example assuming that the disc of Fig. 3 is rotating in the direction of the arrow, then obviously the outer spiral 28 scans the image 29 from right to left. Consequently if the monitoring lamp 25 were on the same side of the disc as is the photo-cell 16 and this lamp were viewed through the disc from the front, the image as reproduced by the monitoring lamp 25 would be in the proper right-left position. It is obvious, however, that the person operating the camera or pick-up unit cannot be positioned in front of the disc since this Would interfere with the scanning of the object. It is for this purpose that the lamp 25 is positioned in front of the disc and is viewed by the monitoring operator from the rear of the disc. However, in order to preserve the proper right-left direction of the monitored image the inner spiral 27 is in the reverse direction from the outerspiral 28.

On the other hand, inasmuch as the optical system 2l projects the image in a reverse up anddown direction, the inner spiral 27 scans the image vertically in the opposite direction irom'the outer spiral 28, thus the image as reproduced bythe monitoring lamp is in the proper up and down relation, and in the proper right-leftdirection so that the monitoring operator in looking through the disc 14 sees the image of the object exactly in the same relation as if he were looking directly at the object. The manner in which the lamp 25 is illuminated to reproduce the image is well known in television systems. Suffice it to say that the scene or object being scanned in successive elemental areas by the spiral 28 causes corresponding currents to be generated in the cellV 16, which are amplified by the amplier 17 and these amplied currents may be transmitted directly over wire or by means of radio to a distant station. A portion of this amplifier current is diverted to the lamp 25 so that the said lamp varies in brilliancy in accordance with the response of the photo-electric cell 16.

If desired the lamp 25 may be directly connected to the amplier 1'?. In the event, however that the televised signals are to be transmitted by radio,

a small monitoring radio receiving set may be attached to the platform 10 and the output of this radio set impressed upon the lamp 25, thus giving a double check on the pick-up and the radio transmission.

Inasmuch as the amplifying equipment and photo-electric pick-up unit is preferably in optical alignment with the system 21, it is necessary to mount the monitoring lamp 25 and the viewing device 26 to one side of this housing. Consequently the inner spiral 27 is designed so as to scan the monitoring lamp in spacial synchronism with the scanning of the outer spiral 28. In other Words the iirst scanning element 30 of the outer spiral begins to scan the image 29 at the same time that the iirst scanning element 31 of the inner spiral scans the monitoring lamp. If desired `of course the monitoring lamp may be positioned at any kother part of the disc, for example it may be positioned diametrically opposite to the image 29 in Which event of course the monitoring spiral 27 must be so arranged as to preserve the proper relation between its scanning andthe scan ning of the image by the outer spiral. Y

There is thus-provided a unitary television pickup camera which is readily adjustable to pick up images at different points and at the same time the operator is enabled to view the image as actually reproduced by televisionmeans, thus enabling a constant check to be made onthe television pickup as well as on the electrical transmission. Y

-Various Vchanges and modiiications may be made herein without departing `from the spirit and scope of the invention.

What is claimed is: v i i 1. A television pick-up machine comprising a scanning disc` having two separate series of scanning elements arranged in spiral sequence, each.

series-extending substantially entirely around the disc, the elements of one series having an opposite pitch from the elements of the other series, a photo-electric cell cooperating with one series, and a monitoring image reproducing lamp cooperatingwith theother of said series.

2. A television pickfup machine comprising a scanning disc having two oppositely pitched spiral series of scanning perforations, each series extending substantially entirely around the disc, a photoelectric cell cooperating with one of said series, and an image reproducing monitoring klamp co,- operating with the other ofsaid series.

3. A. television pick-up machine comprising a stand, a shaft mountedfor rotation on said stand, a motor carried by said shaft, `a television scanning disc attached to the motor shaft, a monitoring lamp supported by therst mentioned shaft in front of said disc, and a photo-electric cell supported'by said shaft in the rear of said disc, said disc having two separate series of scanning ele-- ments arranged in spiral sequence, each series extending substantially entirely around the disc. 

